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19 October, 19:50

A 10-g bullet moving horizontally with a speed of 1.8 km/s strikes and passes through a 5.0-kg block initially at rest on a horizontal frictionless surface. The bullet emerges from the block with a speed of 1.0 km/s. What is the kinetic energy of the block immediately after the bullet emerges? a. 8.0. J 6.4 J 5.3 J 9.4 J 10 J e.

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  1. 19 October, 20:19
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    6.4 J

    Explanation:

    m = mass of the bullet = 10 g = 0.010 kg

    v = initial velocity of bullet before collision = 1.8 km/s = 1800 m/s

    v' = final velocity of the bullet after collision = 1 km/s = 1000 m/s

    M = mass of the block = 5 kg

    V = initial velocity of block before collision = 0 m/s

    V' = final velocity of the block after collision = ?

    Using conservation of momentum

    mv + MV = mv' + MV'

    (0.010) (1800) + (5) (0) = (0.010) (1000) + (5) V'

    V' = 1.6 m/s

    Kinetic energy of the block after the collision is given as

    KE = (0.5) M V'²

    KE = (0.5) (5) (1.6) ²

    KE = 6.4 J
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